SQ Fix mpich

pkgs/mpich/default.nix

@@ -4,11 +4,13 @@
 , libfabric
 , mpich
 , pmix
+, gfortran
+, symlinkJoin
 }:
 
 let
   # pmix comes with the libraries in .out and headers in .dev
-  pmixAll = lib.symlinkJoin {
+  pmixAll = symlinkJoin {
     name = "pmix-all";
     paths = [ pmix.dev pmix.out ];
   };